Was that with Enblend or Multiblend? Have you made sure to mask out the 
shadowed/darkened strip at the edge, as well as the actual square?

On Tuesday, 13 April 2021 at 05:19:41 UTC+1 Jared wrote:

> Ah.  Well that makes much more sense.  Sorry, that's my bad.  So what 
> you're seeing is a square that I use to align stuff on my scanner - just 
> aligning against any of the edges around the glass results in the sides of 
> the image being cropped off.  I didn't think it'd have an effect on the 
> blending process, so I had planned to crop it out of the stitched image.
>
> Here's my latest attempt:
> https://boxdog.legroom.net/public/ffmap-example3.jpg
>
> Sadly, not much of an improvement.  Actually a bit worse, as the middle 
> section is darker now as well.  After applying the mask, I generated one 
> image with no other changes (not shown - pretty much the same as example2, 
> though), and then for this image I clicked Calculate for Optimize, 
> Photometric, Low dynamic range, variable white balance.  Is there some 
> other option I should try to apply proper blending after that border is 
> masked out?
>
> Again, I appreciate the continued support.
>
>
> On Monday, April 12, 2021 at 7:13:08 PM UTC-5 Monkey wrote:
>
>> That's not the border I meant. It's the thin gray border with black lines 
>> which is at the top and/or left and/or bottom of *all* the images. It 
>> might be part of the scanner lid being visible or something you put behind 
>> the folded page.
>>
>> On Monday, 12 April 2021 at 21:34:06 UTC+1 Jared wrote:
>>
>>> Ha.  So keeping in mind I'm new to hugin and figuring this out as I go, 
>>> my first attempt at creating a mask didn't exactly go as planned.  Here's a 
>>> screenshot of the resulting image:
>>> https://boxdog.legroom.net/public/ffmap-example2.jpg
>>>
>>> Technically I think I did mask that out, but I'm guessing that's not 
>>> what you had in mind.  :-)
>>>
>>> So that's the result of an exclude mask that I added to the two 
>>> left-most source images.  Can you provide any more detail on how I *should* 
>>> create that mask?  I tried referencing the mask tutorial (
>>> http://hugin.sourceforge.net/tutorials/Blend-masks/en.shtml), but it 
>>> seems like that's addressing a fundamentally different issue, so wasn't 
>>> sure how to apply that to this image.
>>>
>>> On Monday, April 12, 2021 at 6:25:13 AM UTC-5 Monkey wrote:
>>>
>>>> The problem is the grey border with black lines on the top and left of 
>>>> the images (and the shadow it casts on the page). Mask those out and it 
>>>> should then blend as expected.
>>>>
>>>> On Monday, 12 April 2021 at 03:46:41 UTC+1 Jared wrote:
>>>>
>>>>> Hello.  Appreciate your continued guidance on this.  I got the canvas 
>>>>> size down to a usable state so I can open it in GIMP now.  Still having 
>>>>> trouble with the blending, though.  I tried Bruno's white balance 
>>>>> suggestion, and then spent a while fiddling with a bunch of different 
>>>>> options to see if I could come up with anything, but no luck.  I've 
>>>>> uploaded scaled versions of the remmaped files, plus the full image and 
>>>>> PTO 
>>>>> file for reference, here:
>>>>>
>>>>> https://boxdog.legroom.net/public/transfer/
>>>>>
>>>>> Looking closely at the source images, it looks like there is a little 
>>>>> color difference between the two left-most segments and the rest of the 
>>>>> map 
>>>>> (even though it was all scanned under the same conditions), but nowhere 
>>>>> near what's shown in the final image.  I also noticed that the second 
>>>>> column is oddly darker as well - look at the water below point 2 and to 
>>>>> the 
>>>>> left of point 1 around the bottom center of the map.  All of the water 
>>>>> should be a reasonably uniform blue, except for those 4 stains in the 
>>>>> upper-left.
>>>>>
>>>>> On Wednesday, April 7, 2021 at 5:48:32 AM UTC-5 Monkey wrote:
>>>>>
>>>>>> If the remapped images don't show the difference in colour, but the 
>>>>>> blend still does, could you output a reduced size remapped image set and 
>>>>>> upload it somewhere?
>>>>>>
>>>>>> On Tuesday, 6 April 2021 at 22:00:38 UTC+1 bruno...@gmail.com wrote:
>>>>>>
>>>>>>> On Tue 06-Apr-2021 at 13:46 -0700, Jared wrote: 
>>>>>>> > 
>>>>>>> >I have one additional question, if you don't mind - the stiching 
>>>>>>> came out 
>>>>>>> >well, but the blending is off. Here's a much smaller version of the 
>>>>>>> >stiched image for reference: 
>>>>>>> >https://boxdog.legroom.net/public/ffmap-example.jpg 
>>>>>>> > 
>>>>>>> >Note that the left column is darker than the rest. The source 
>>>>>>> images 
>>>>>>> >aren't like that - they're uniformly blue. I suspect it's those 
>>>>>>> dark 
>>>>>>> >splotches, I guess some kind of oil or water stains, that's 
>>>>>>> throwing off 
>>>>>>> >the blending. Is there any reasonably straightforward way to tune 
>>>>>>> that to 
>>>>>>> >get the original brighter blue across the full image? Both enblend 
>>>>>>> and 
>>>>>>> >multiblend produced similar results. 
>>>>>>>
>>>>>>> Hugin will try and optimise the brightness and colour of your images 
>>>>>>> to match if you ask it to, but your PTO project has default values 
>>>>>>> for photometric parameters. So it looks like your photos are 
>>>>>>> different somehow. 
>>>>>>>
>>>>>>> In the Photos tab, optimise Photometric -> Low dynamic range, 
>>>>>>> variable white balance. 
>>>>>>>
>>>>>>> -- 
>>>>>>> Bruno 
>>>>>>>
>>>>>>

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